You can use the chest and collect the Snow of Eternal Slumber while in the spirit world, however you need to be alive to see the spirits (ironically). Speak to Gan'jo and he will offer you the option to come back to life.

When you use the snow, it will freeze the spirit briefly, then it will run back to its crypt and its mummified corpse will burn up, spawning the spirit particle. As each spirit runs to its body, it will say something random: